中文摘要 台灣是一個擁有相當多豐富生態資源以及地形、氣候變化大的地方,而台灣的河川更是孕育大地萬物,供給食物與生物棲息地的所在。因此在河川的治理上,為了維護與創造河溪生態多樣性的理念下,漸漸地採用包含治水、利水、親水環境三者共存共榮之「河川近自然工法」。本研究以台中地區筏子溪之近自然工法規劃設計為例,並以美國水文研究中心所發展的河川分析系統(HEC-RAS)進行高水分析,印證設計河段通洪能力,比較規劃設計前後對河川水位之影響。本研究案例之斷面設計及高水分析方法已有初步成果,期能對河川近自然工法整治提供應用之參考。 關鍵詞:河川近自然工法、高水分析、HEC-RAS
Abstract Formosa Taiwan is a place with diverse natural resources, and it also nurtures the creation and supplies the habitats for breeding and feeding in the river region. In order to maintain and create the biodiversity around the water environment, “The Near-Natural Working Method” is gradually considered in harnessing, utilizing and approaching the river region. And the design and plan with near-natural working method at Fa-Tzu River in Tai-Chung area is selected as simulated example. The River Analysis System developed by the Hydrologic Engineering Center(HEC-RAS) in America is performed one-dimensional steady flow hydraulics. Therefore, the high water level analyses those are compared before and after the design in Fa-Tzu River prove the ability of conveyance by the system HEC-RAS. As a result of the initial achievements about the cross section design and high water level analysis, the study aims at offing the suggestions to the application in harnessing the river by the plan with the Near-Natural working method. Keywords:Near-Natural working method, High water level analysis, HEC-RAS